Dry Electrode Manufacturing

 

About:

  • Currently, the cells are manufactured using the Slurry Wet Coating Technology. This technology has some drawbacks such as solvent toxicity, reactivity between electrode material and solvent and unwanted changes of physicochemical properties of coated electrodes.  

  • Maxwell’s proprietary solvent-free coating technology resolves such issues.  

  • This technology offers manufacturing cost and performance differentiation as well as novel battery chemistry enablement. 

  • Maxwell Technologies is actively engaged in this global cost reduction effort through its development and refinement of its proprietary dry electrode fabrication technology.  

Technology Description:​​​​​​​​​​​​​​

  • It begins with dry raw materials and maintains its liquid-free state throughout the subsequent processing steps to ultimately produce a robust high-performance ultra-capacitor electrode. Maxwell’s proprietary dry coating electrode technology is comprised of three steps: 

  • Dry powder mixing: All dry powder material is mixed using Maxwell’s proprietary dry coating process to yield a final powder mixture consisting of active material, binder and conductive additive.  

  • Powder to film formation: This powder mixture is calendered to form a continuous self-supporting dry coated electrode film that is wound in roll form.  

  • Film to current collector lamination: All laminated dry coated electrodes are dried under vacuum at 1200 Celsius overnight to remove any ambient moisture before being assembled into pouch cell in an Ar-filled glove box for the small cell format or in dry-room conditions for the large cell format. 

​​​​​​​

References:


Comments

Post a Comment

Popular posts from this blog

Types of NMC (111, 442, 532, 622, 811)

Image
  About: In the automotive battery industry, one of the most successful Li-ion chemistries is the cathode combination of nickel manganese cobalt oxide (NMC). LiNi1-x-yMnxCoyO2 (NMC) has similar or higher specific capacity than LCO and similar operating voltage while having lower cost since the Co content is reduced. LiNi1/3Mn1/3Co1/3O2 (NMC-111) is the most common form of NMC and is widely used in the battery market. Another successful combination of NMC is LiNi0.5Mn0.3Co0.2O2 (NMC-532). Other combinations using various amounts of metals are possible.  Technology Description: ​​​​​​​​​​​​​​ For NMC, nickel is known for its high energy density but poor stability. Manganese has the benefit of forming a spinel structure to achieve low internal resistance, but gives a low specific energy. Combing the two metal elements can improve each other’s merits. NMC-based battery technology is also well-suited for EV applications...
Read more

Lithium Manganese Oxide (LiMn₂O₄) — LMO

Image
  About: Lithium-ion is named for its active materials; the words are either written in full or shortened by their chemical symbols. A series of letters and numbers strung together can be hard to remember and even harder to pronounce, and battery chemistries are also identified in abbreviated letters.  For example, lithium cobalt oxide, one of the most common Li-ions, has the chemical symbols LiCoO 2  and the abbreviation LCO. For reasons of simplicity, the short form Li-cobalt can also be used for this battery. Cobalt is the main active material that gives this battery character. Other Li-ion chemistries are given similar short-form names.   Technology Description: ​​​​​​​​​​​​​​ Li-ion with manganese spinel was first published in the Materials Research Bulletin in 1983. In 1996, Moli Energy commercialized a Li-ion cell with lithium manganese oxide as cathode material. The architecture forms a three-dimensional spinel structure that improves ion flow ...
Read more

Sodium-Ion (Na-Ion)

  About  As the cost and availability of Lithium is an issue, the search for alternate materials is going on  Sodium is an alternate material which is cheaper and more abundant in nature Technology Description  The Na-Ion batteries use (Na) Sodium as the cathode instead of Li They are cheaper and more abundant but lose out on energy density  The cells are more durable in nature Type of anode material (hard carbon) used for these types of cells is different  due to the different size of molecules The general details on this type of cell whose research is being done by Faradion  Parameter Comment  Voltages (V) 4.3 Energy Density (Wh/kg)  >140 Cycling (C-rate)  0.1 to 2 Temperature Range ( 0 C) -20 to 60 References  https://www.freepatentsonline.com/WO2017073066A1.pdf https://www.faradion.co.uk/technology-benefits/strong-performance/
Read more